The table lists the maximum supported number of components in a project.

Item

Protocol

System limit
(max. per project)

Edge controller

IP/Modbus/M-Bus

1

Fan coil system limits

Item

Protocol

System limit
(max. per project)

Thermostat

Modbus

100
RS-485 limitations for more than 32 devices apply.

Heat/cooling meter

M-Bus

4
With an additional M-Bus converter (see note below) connected to the M-Bus interface, more devices can be powered.

Electrical meter

Modbus

32
Additional meters require Modbus (RS-485) repeaters. Note: the total maximum is 100 Modbus devices per CXE200.

Room operating mode scheduler

-

10

Note: The dashboard function can handle multiple meters. The figure shows a topology with an M-Bus converter (for further details, see WTV531-GA5060 Level converter 60, https://siemens.com/bt/download → ID: A6V10923897).

Wireless solution limits

Item

Protocol

System limit
(max. per device/project)

Thread border router (TBR)

Thread

4 per edge controller
(1 TBR device => 1 network)

Thread mesh extender (TME)

Thread

15 per network

Wireless room actuator (WRA)

Thread

20 per TBR/TME device
100 per network
(the maximum quantity is the total sum of WRA, WRS, and WRU)

Wireless room sensor (WRS)

Thread

20 per TBR/TME device
100 per network
(the maximum quantity is the total sum of WRA, WRS, and WRU)

Setpoint scheduler

-

10

For further Thread system limits, see KNX IoT Thread System Description, https://siemens.com/bt/download → ID: A6V14455022.